From 4d7ea04118631de805f4cd8ae4c1cc12fee2a6fb Mon Sep 17 00:00:00 2001
From: Will Charczuk <will@blendlabs.com>
Date: Fri, 21 Oct 2016 17:01:02 -0700
Subject: [PATCH] comment.

---
 image_writer.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/image_writer.go b/image_writer.go
index b4ddb7a..e9cfd7a 100644
--- a/image_writer.go
+++ b/image_writer.go
@@ -7,6 +7,7 @@ import (
 	"image/png"
 )
 
+// RGBACollector is a render target for a chart.
 type RGBACollector interface {
 	SetRGBA(i *image.RGBA)
 }